v2=2.81

Solution for v2=2.81 equation:

v2=2.81

We move all terms to the left:

v2-(2.81)=0

We add all the numbers together, and all the variables

v^2-2.81=0

a = 1; b = 0; c = -2.81;
Δ = b2-4ac
Δ = 02-4·1·(-2.81)
Δ = 11.24
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$v_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$v_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$v_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-\sqrt{11.24}}{2*1}=\frac{0-\sqrt{11.24}}{2}
=-\frac{\sqrt{}}{2}
$
$v_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+\sqrt{11.24}}{2*1}=\frac{0+\sqrt{11.24}}{2}
=\frac{\sqrt{}}{2}
$